[K/N] Set target-features for host targets

Benchmarks on CI show that there are some performance regressions after
LLVM update due to worse inliner results. Explicit specification of
target-features fixes the problem. Interestingly, it seems that this is
not required for Darwin AArch64 target.

kotlin-native/konan/konan.properties

@@ -108,6 +108,7 @@ targetToolchain.macos_arm64-macos_x64 = target-toolchain-xcode_12_5
 targetTriple.macos_x64 = x86_64-apple-macos
 targetSysRoot.macos_x64 = target-sysroot-xcode_12_5-macosx
 targetCpu.macos_x64 = core2
+targetCpuFeatures.macos_x64=+cx16,+cx8,+fxsr,+mmx,+sahf,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87
 clangFlags.macos_x64 = -cc1 -emit-obj -disable-llvm-passes -x ir
 clangNooptFlags.macos_x64 = -O1
 clangOptFlags.macos_x64 = -O3
@@ -522,6 +523,7 @@ targetSysRoot.linux_x64 = $gccToolchain.linux_x64/x86_64-unknown-linux-gnu/sysro
 # targetSysroot-relative.
 libGcc.linux_x64 = ../../lib/gcc/x86_64-unknown-linux-gnu/8.3.0
 targetCpu.linux_x64 = x86-64
+targetCpuFeatures.linux_x64 = +cx8,+fxsr,+mmx,+sse,+sse2,+x87
 clangFlags.linux_x64 = -cc1 -target-cpu $targetCpu.linux_x64 -emit-obj -disable-llvm-optzns -x ir \
    -ffunction-sections -fdata-sections
 clangNooptFlags.linux_x64 = -O1
@@ -894,6 +896,7 @@ dependencies.mingw_x64 = \
 targetTriple.mingw_x64 = x86_64-pc-windows-gnu
 targetSysRoot.mingw_x64 = msys2-mingw-w64-x86_64-clang-llvm-lld-compiler_rt-8.0.1
 targetCpu.mingw_x64 = x86-64
+targetCpuFeatures.mingw_x64 = +cx8,+fxsr,+mmx,+sse,+sse2,+x87
 # For using with Universal Windows Platform (UWP) we need to use this slower option.
 # See https://youtrack.jetbrains.com/issue/KT-27654.
 # TODO: remove, once fixed in mingw, check with the bug testcase.