Basic: query the target pointer width from clang

Use the `clang::TargetInfo` to query the target pointer size for the
given triple. This is meant to enable us to properly determine
`CMAKE_SIZEOF_VOID_P`.

include/swift/Basic/TargetInfo.h

@@ -33,7 +33,8 @@ namespace targetinfo {
 void printTargetInfo(const CompilerInvocation &invocation,
                      llvm::raw_ostream &out);
 
-void printTripleInfo(const llvm::Triple &triple,
+void printTripleInfo(const CompilerInvocation &invocation,
+                     const llvm::Triple &triple,
                      std::optional<llvm::VersionTuple> runtimeVersion,
                      llvm::raw_ostream &out);
 } // namespace targetinfo