[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Yet another BitBlt source pastEnd access (#441)

[Nicolas Cellier]

Observed while simulating newspeak with this stack:

```
  16r107230 M BitBlt>copy:from:in:fillColor:rule: 16r320338: a(n) BitBlt  16r10725C M Form>copy:from:in:rule: 16r31F618: a(n) Form
  16r1072A0 M StrikeFont>characterFormAt:put: 16r318E60: a(n) StrikeFont
  16r1072D4 I StrikeFont>ensureCleanBold 16r318E60: a(n) StrikeFont
  16r1072FC M StrikeFont>emphasized: 16r8EAFE8: a(n) StrikeFont
  16r10731C M BrazilStringMorph(StringMorph)>fontToUse 16r314AF8: a(n) BrazilStringMorph
  16r107338 M BrazilStringMorph(StringMorph)>measureContents 16r314AF8: a(n) BrazilStringMorph
  16r107358 M BrazilStringMorph(StringMorph)>fitContents 16r314AF8: a(n) BrazilStringMorph
  16r107370 M BrazilStringMorph(StringMorph)>font:emphasis: 16r314AF8: a(n) BrazilStringMorph
  16r107398 I BrazilStringMorph(StringMorph)>font: 16r314AF8: a(n) BrazilStringMorph
  16r1073B4 M LabelMorphicAgent>setMorphFont: 16r1183A0: a(n) LabelMorphicAgent
  16r1073D4 M [] in LabelMorphicAgent(Object)>~ 16r1183A0: a(n) LabelMorphicAgent
  16r1073F0 M AttributeMapping>update 16r316A60: a(n) AttributeMapping
```

The BitBlt spec is:

```
interpreterProxy: 	a Spur32BitMMLECoSimulator
moduleName: 	nil
translatedMethodCache: 	nil
simulator: 	a SmartSyntaxPluginSimulator
destForm: 	3274264
sourceForm: 	3268464
halftoneForm: 	5419272
combinationRule: 	3
destX: 	20
destY: 	0
width: 	1581
height: 	15
sourceX: 	19
sourceY: 	0
clipX: 	0
clipY: 	0
clipWidth: 	1601
clipHeight: 	15
sourceWidth: 	1600
sourceHeight: 	15
sourceDepth: 	1
sourcePitch: 	200
sourceBits: 	3268512
sourcePPW: 	32
sourceMSB: 	true
destWidth: 	1601
destHeight: 	15
destDepth: 	1
destPitch: 	204
destBits: 	3274312
destPPW: 	32
destMSB: 	true
bitCount: 	0
skew: 	-1
mask1: 	4095
mask2: 	2147483648
preload: 	false
nWords: 	51
destMask: 	2147483648
hDir: 	1
vDir: 	1
sourceIndex: 	3271512
sourceDelta: 	-4
destIndex: 	3277368
destDelta: 	0
sx: 	19
sy: 	0
dx: 	20
dy: 	0
bbW: 	1581
bbH: 	15
halftoneHeight: 	0
noSource: 	false
noHalftone: 	true
halftoneBase: 	nil
sourceAlpha: 	nil
srcBitShift: 	0
dstBitShift: 	0
bitBltOop: 	3277624
affectedL: 	0
affectedR: 	15
affectedT: 	0
affectedB: 	15
opTable: 	#(#clearWord:with: #bitAnd:with: #bitAndInvert:with: #sourceWord:with: #bitInvertAnd:with: #destinationWord:with: #bitXor:with: #bitOr:with: #bitInvertAndInvert:with: #bitInvertXor:with: #bitInvertDestination:with: #bitOrInvert:with: #bitInvertSource:with: #bitInvertOr:with: #bitInvertOrInvert:with: #destinationWord:with: #destinationWord:with: #destinationWord:with: #addWord:with: #subWord:with: #rgbAdd:with: #rgbSub:with: #OLDrgbDiff:with: #OLDtallyIntoMap:with: #alphaBlend:with: #pixPaint:with: #pixMask:with: #rgbMax:with: #rgbMin:with: #rgbMinInvert:with: #alphaBlendConst:with: #alphaPaintConst:with: #rgbDiff:with: #tallyIntoMap:with: #alphaBlendScaled:with: #alphaBlendScaled:with: #alphaBlendScaled:with: #rgbMul:with: #pixSwap:with: #pixClear:with: #fixAlpha:with: #rgbComponentAlpha:with:)
maskTable: 	#(1 3 nil 15 31 nil nil 255 nil nil nil nil nil nil nil 65535 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil 4294967295)
ditherMatrix4x4: 	a CArrayAccessor on: #(0 8 2 10 12 4 14 6 3 11 1 9 15 7 13 5)
ditherThresholds16: 	a CArrayAccessor on: #(0 2 4 6 8 10 12 14 16)
ditherValues16: 	a CArrayAccessor on: #(0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30)
hasSurfaceLock: 	false
warpSrcShift: 	5
warpSrcMask: 	4294967295
warpAlignShift: 	0
warpAlignMask: 	0
warpBitShiftTable: 	a CArrayAccessor on: #(0 nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil nil)
querySurfaceFn: 	nil
lockSurfaceFn: 	nil
unlockSurfaceFn: 	nil
isWarping: 	false
cmFlags: 	0
cmMask: 	0
cmShiftTable: 	nil
cmMaskTable: 	nil
cmLookupTable: 	nil
cmBitsPerColor: 	0
dither8Lookup: 	a CArrayAccessor on: #( ...snip byte array of size 4096 ...)
componentAlphaModeColor: 	nil
componentAlphaModeAlpha: 	nil
ungammaLookupTable: 	nil
gammaLookupTable: 	nil
numGCsOnInvocation: 	14
bitBltIsReceiver: 	true
endOfDestination: 	3277372
endOfSource: 	3271512
destinationHashes: 	nil
copyBitsCount: 	nil
copyBitsBreakCount: 	nil
```


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