Replace usage of llvm::utostr_32 with just llvm::utostr. While this is less efficient, its unclear that the one place using the _32 version was doing so for efficiency.

llvm-svn: 259316
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index 3f6b682..c9673c6 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -1788,7 +1788,7 @@
     if (Context.getASTContext().addressSpaceMapManglingFor(AS)) {
       //  <target-addrspace> ::= "AS" <address-space-number>
       unsigned TargetAS = Context.getASTContext().getTargetAddressSpace(AS);
-      ASString = "AS" + llvm::utostr_32(TargetAS);
+      ASString = "AS" + llvm::utostr(TargetAS);
     } else {
       switch (AS) {
       default: llvm_unreachable("Not a language specific address space");