[clang] Add unsigned integer overloads for abs (PR #128257)

[Chris B via cfe-commits]

================
@@ -94,3 +122,60 @@ double3 test_abs_double3(double3 p0) { return abs(p0); }
 // CHECK-LABEL: define noundef nofpclass(nan inf) <4 x double> @_Z16test_abs_double4
 // CHECK: call reassoc nnan ninf nsz arcp afn <4 x double> @llvm.fabs.v4f64(
 double4 test_abs_double4(double4 p0) { return abs(p0); }
+
+
+// CHECK-LABEL: define {{.*}}hlsl3abs{{.*}}(i32
+// CHECK: [[Alloca:%.*]] = alloca i32
----------------
llvm-beanz wrote:

I don't think we should be testing the implementation of `constexpr` in this PR. That really just adds extra testing time without meaningfully adding coverage since `constexpr` is extensively tested in the compiler elsewhere.

If this were not a constexpr-able function we should have gotten an error elsewhere and boy would that be a big a surprise given what the function does!

https://github.com/llvm/llvm-project/pull/128257