Add a test for checking that MSVC intrinsics are actually available f…

…rom C.

compiler/test/compilable/msvc_intrinsics.c

@@ -0,0 +1,31 @@
+// LINK:
+// REQUIRED_ARGS: -os=windows
+// PERMUTE_ARGS: -i -betterC
+// Checking that the MSVC intrinsics reimplemented for ImportC are actually available from C.
+
+#if defined(_M_AMD64)
+unsigned long long multiplyU128(unsigned long long a, unsigned long long b, unsigned long long* high)
+{
+    return _umul128(a, b, high);
+}
+#elif defined(_M_IX86)
+int interlockedAddLarge(long long *target, int value)
+{
+    return _InterlockedAddLargeStatistic(target, value);
+}
+#elif defined(_M_ARM64)
+unsigned long long multiplyUHigh64(unsigned long long a, unsigned long long b)
+{
+    return __umulh(a, b);
+}
+#elif defined(_M_ARM)
+void dmb(void)
+{
+    __dmb(11);
+}
+#endif
+
+int main(void)
+{
+    return 0;
+}