Use getTypeAllocSize() instead of getTypeSizeInBits()

The function `getTypeSizeInBits()` was wrongly used in many places when
reasoning about memory allocation, memory accesses, and memory offsets,
The result was often divided by 8 (possibly losing spare bits) or even
multiplied by 8, which makes no sense.
These uses were error prone, even if they didn't cause problems yet.
The `getTypeAllocSize()` is better suited for these uses, because it
returns the number of bytes necessary to allocate an object of the given
Type.

generatedcodebasicinfo.cpp

@@ -41,7 +41,7 @@ bool GeneratedCodeBasicInfo::runOnFunction(llvm::Function &F) {
   SP = M->getGlobalVariable(QMD.extract<StringRef>(Tuple, 3), true);
 
   Type *PCType = PC->getType()->getPointerElementType();
-  PCRegSize = M->getDataLayout().getTypeSizeInBits(PCType) / 8;
+  PCRegSize = M->getDataLayout().getTypeAllocSize(PCType);
 
   for (BasicBlock &BB : F) {
     if (!BB.empty()) {