[Clang] Fix JIT test on 32-bit systems

As reported by mgorny at https://reviews.llvm.org/D159115#4638037, the
unsigned long long cast fails on 32-bit systems at least with GCC.

It looks like a pointer provenance/aliasing issue rather than a bug in GCC.

Acked by Vassil Vassilev on the original revision.

(cherry picked from commit 3403686)

clang/unittests/Interpreter/InterpreterTest.cpp

@@ -244,7 +244,7 @@ TEST(IncrementalProcessing, FindMangledNameSymbol) {
 
   // FIXME: Re-enable when we investigate the way we handle dllimports on Win.
 #ifndef _WIN32
-  EXPECT_EQ((unsigned long long)&printf, Addr->getValue());
+  EXPECT_EQ((uintptr_t)&printf, Addr->getValue());
 #endif // _WIN32
 }