Add AddNull argument to CreateGlobalString. (llvm#93036)

There's currently no way to control whether a null terminator should be
appended to the string created in `CreateGlobalString` /
`CreateGlobalStringPtr`, since the methods don't expose an additional
argument.
This change adds an additional argument to the methods that has the same
default value, `true`, as in `ConstantDataArray::getString`, and passes
it down to this internal method.

Author: tsymalla

llvm/include/llvm/IR/IRBuilder.h

@@ -455,7 +455,7 @@ class IRBuilderBase {
   /// block.
   GlobalVariable *CreateGlobalString(StringRef Str, const Twine &Name = "",
                                      unsigned AddressSpace = 0,
-                                     Module *M = nullptr);
+                                     Module *M = nullptr, bool AddNull = true);
 
   /// Get a constant value representing either true or false.
   ConstantInt *getInt1(bool V) {
@@ -1992,8 +1992,9 @@ class IRBuilderBase {
   /// block.
   Constant *CreateGlobalStringPtr(StringRef Str, const Twine &Name = "",
                                   unsigned AddressSpace = 0,
-                                  Module *M = nullptr) {
-    GlobalVariable *GV = CreateGlobalString(Str, Name, AddressSpace, M);
+                                  Module *M = nullptr, bool AddNull = true) {
+    GlobalVariable *GV =
+        CreateGlobalString(Str, Name, AddressSpace, M, AddNull);
     Constant *Zero = ConstantInt::get(Type::getInt32Ty(Context), 0);
     Constant *Indices[] = {Zero, Zero};
     return ConstantExpr::getInBoundsGetElementPtr(GV->getValueType(), GV,

llvm/lib/IR/IRBuilder.cpp

@@ -43,8 +43,8 @@ using namespace llvm;
 GlobalVariable *IRBuilderBase::CreateGlobalString(StringRef Str,
                                                   const Twine &Name,
                                                   unsigned AddressSpace,
-                                                  Module *M) {
-  Constant *StrConstant = ConstantDataArray::getString(Context, Str);
+                                                  Module *M, bool AddNull) {
+  Constant *StrConstant = ConstantDataArray::getString(Context, Str, AddNull);
   if (!M)
     M = BB->getParent()->getParent();
   auto *GV = new GlobalVariable(