[libc] Make div test names unique

[abrachet]

Summary

In Fuchsia, all tests in a directory, ie stdlib, are linked into one executable, this causes problems for multiple definitions of the vtables of the div tests because their class has the same name. This patch just trivially changes their name to be unique between all div tests.

[sivachandra]

libc/test/src/stdlib/DivTest.h

37

Can CAT be inlined?

[abrachet]

libc/test/src/stdlib/DivTest.h

37

Ah you're right. For some reason I thought there would be some issue with not forcing this to be evaluated first. I have committed it with just SimpleTest##ReturnType

libc/test/src/stdlib/DivTest.h

void simpleTest(DivFunc func) {
     result = func(10, -3);
     EXPECT_EQ(result.quot, IntType(-3));
     EXPECT_EQ(result.rem, IntType(1));
   }
 };
 
 #define LIST_DIV_TESTS(IntType, ReturnType, func)                              \
   using LlvmLibcDivTest = DivTest<IntType, ReturnType>;                        \
-  TEST_F(LlvmLibcDivTest, SimpleTest) { simpleTest(func); }
+  TEST_F(LlvmLibcDivTest, SimpleTest##ReturnType) { simpleTest(func); }