testsuite: Fix pr94185.C testcase on i686-linux with C++98 [PR94185]

I'm getting on i686-linux
FAIL: g++.target/i386/pr94185.C  -std=gnu++98 (test for excess errors)
This is because of a diagnostic that 4294967295 is unsigned only in ISO C90.
Adding U suffix fixes it and the testcase still ICEs with unfixed gcc and
passes with current trunk.

2020-03-17  Jakub Jelinek  <jakub@redhat.com>

	PR target/94185
	* g++.target/i386/pr94185.C (l): Use 4294967295U instead of 4294967295
	to avoid FAIL with -m32 -std=c++98.

gcc/testsuite/ChangeLog

+2020-03-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/94185
+	* g++.target/i386/pr94185.C (l): Use 4294967295U instead of 4294967295
+	to avoid FAIL with -m32 -std=c++98.
+
 2020-03-17  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* gcc.target/aarch64/sve/acle/general-c/sizeless-1.c: Remove

gcc/testsuite/g++.target/i386/pr94185.C

@@ -22,7 +22,7 @@ int d;
 void l(char *, ar m, long n) {
   switch (m.au[d])
   case 0:
-    n &= 4294967295;
+    n &= 4294967295U;
   bb.h(0).g(n);
 }
 void o() {