fixup! [libc][math] Optimize nearest integer functions using builtins when available

Nit: sort roundeven after round.

Author: overmighty

libc/test/src/math/performance_testing/CMakeLists.txt

@@ -391,10 +391,10 @@ add_perf_binary(
     libc.src.math.floorf16
     libc.src.math.rintf
     libc.src.math.rintf16
-    libc.src.math.roundevenf
-    libc.src.math.roundevenf16
     libc.src.math.roundf
     libc.src.math.roundf16
+    libc.src.math.roundevenf
+    libc.src.math.roundevenf16
     libc.src.math.truncf
     libc.src.math.truncf16
   COMPILE_OPTIONS

libc/test/src/math/performance_testing/nearest_integer_funcs_perf.cpp

@@ -152,21 +152,21 @@ int main() {
                        FLOAT16_ROUNDS, "ceilf16_perf.log")
   NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::floorf16, ::placeholderf16,
                        FLOAT16_ROUNDS, "floorf16_perf.log")
-  NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::roundevenf16, ::placeholderf16,
-                       FLOAT16_ROUNDS, "roundevenf16_perf.log")
   NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::roundf16, ::placeholderf16,
                        FLOAT16_ROUNDS, "roundf16_perf.log")
+  NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::roundevenf16, ::placeholderf16,
+                       FLOAT16_ROUNDS, "roundevenf16_perf.log")
   NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::truncf16, ::placeholderf16,
                        FLOAT16_ROUNDS, "truncf16_perf.log")
 
   NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::ceilf, ::ceilf, FLOAT_ROUNDS,
                        "ceilf_perf.log")
   NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::floorf, ::floorf, FLOAT_ROUNDS,
                        "floorf_perf.log")
-  NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::roundevenf, ::placeholderf,
-                       FLOAT_ROUNDS, "roundevenf_perf.log")
   NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::roundf, ::roundf, FLOAT_ROUNDS,
                        "roundf_perf.log")
+  NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::roundevenf, ::placeholderf,
+                       FLOAT_ROUNDS, "roundevenf_perf.log")
   NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::truncf, ::truncf, FLOAT_ROUNDS,
                        "truncf_perf.log")