[libc][obvious] fix formatting mistake

I missed two instances of "SetUp" being replaced by "set_up" and
"TearDown" being replaced by "tear_down" when finalizing the formatting
change. This fixes that.

Differential Revision: https://reviews.llvm.org/D116178

Author: michaelrj-google

libc/benchmarks/LibcBenchmarkTest.cpp

@@ -50,9 +50,9 @@ class LibcBenchmark : public ::testing::Test {
   }
 
 protected:
-  void set_up() override { Options.Log = BenchmarkLog::Full; }
+  void SetUp() override { Options.Log = BenchmarkLog::Full; }
 
-  void tear_down() override {
+  void TearDown() override {
     // We make sure all the expected measurements were performed.
     if (MaybeTimepoints)
       EXPECT_THAT(*MaybeTimepoints, IsEmpty());

libc/test/src/signal/sigprocmask_test.cpp

@@ -21,9 +21,9 @@ class LlvmLibcSignalTest : public __llvm_libc::testing::Test {
   sigset_t oldSet;
 
 public:
-  void set_up() override { __llvm_libc::sigprocmask(0, nullptr, &oldSet); }
+  void SetUp() override { __llvm_libc::sigprocmask(0, nullptr, &oldSet); }
 
-  void tear_down() override {
+  void TearDown() override {
     __llvm_libc::sigprocmask(SIG_SETMASK, &oldSet, nullptr);
   }
 };