[libc] fix -Wextra-semi (#123783)

Found while trying to consolidate our command line flags between tests and
underlying object files.

    error: extra ';' after member function definition [-Werror,-Wextra-semi]

Link: #119281

Author: nickdesaulniers

libc/cmake/modules/LLVMLibCTestRules.cmake

@@ -35,7 +35,7 @@ function(_get_common_test_compile_options output_var c_test flags)
     # list(APPEND compile_options "-Wno-sign-conversion")
     # list(APPEND compile_options "-Wimplicit-fallthrough")
     # list(APPEND compile_options "-Wwrite-strings")
-    # list(APPEND compile_options "-Wextra-semi")
+    list(APPEND compile_options "-Wextra-semi")
     # Silence this warning because _Complex is a part of C99.
     if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
       if(NOT c_test)

libc/test/src/math/smoke/nan_test.cpp

@@ -23,7 +23,7 @@ class LlvmLibcNanTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
     auto actual_fp = LIBC_NAMESPACE::fputil::FPBits<double>(result);
     auto expected_fp = LIBC_NAMESPACE::fputil::FPBits<double>(bits);
     EXPECT_EQ(actual_fp.uintval(), expected_fp.uintval());
-  };
+  }
 };
 
 TEST_F(LlvmLibcNanTest, NCharSeq) {

libc/test/src/math/smoke/nanf128_test.cpp

@@ -28,7 +28,7 @@ class LlvmLibcNanf128Test : public LIBC_NAMESPACE::testing::FEnvSafeTest {
     auto actual_fp = FPBits128(result);
     auto expected_fp = FPBits128(bits);
     EXPECT_EQ(actual_fp.uintval(), expected_fp.uintval());
-  };
+  }
 };
 
 TEST_F(LlvmLibcNanf128Test, NCharSeq) {

libc/test/src/math/smoke/nanf16_test.cpp

@@ -23,7 +23,7 @@ class LlvmLibcNanf16Test : public LIBC_NAMESPACE::testing::FEnvSafeTest {
     auto actual_fp = LIBC_NAMESPACE::fputil::FPBits<float16>(result);
     auto expected_fp = LIBC_NAMESPACE::fputil::FPBits<float16>(bits);
     EXPECT_EQ(actual_fp.uintval(), expected_fp.uintval());
-  };
+  }
 };
 
 TEST_F(LlvmLibcNanf16Test, NCharSeq) {

libc/test/src/math/smoke/nanf_test.cpp

@@ -23,7 +23,7 @@ class LlvmLibcNanfTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
     auto actual_fp = LIBC_NAMESPACE::fputil::FPBits<float>(result);
     auto expected_fp = LIBC_NAMESPACE::fputil::FPBits<float>(bits);
     EXPECT_EQ(actual_fp.uintval(), expected_fp.uintval());
-  };
+  }
 };
 
 TEST_F(LlvmLibcNanfTest, NCharSeq) {

libc/test/src/math/smoke/nanl_test.cpp

@@ -33,7 +33,7 @@ class LlvmLibcNanlTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
     auto actual_fp = LIBC_NAMESPACE::fputil::FPBits<long double>(result);
     auto expected_fp = LIBC_NAMESPACE::fputil::FPBits<long double>(bits);
     EXPECT_EQ(actual_fp.uintval(), expected_fp.uintval());
-  };
+  }
 };
 
 TEST_F(LlvmLibcNanlTest, NCharSeq) {