`clang-cl` toolchain for x86 (32-bit) binaries is missing

## Description of the problem:

As the protobuf team is planning to stop supporting the combination of Bazel and `cl.exe` and start recommending `clang-cl.exe` as the alternative, our project (https://github.com/google/mozc) is reviewing what are potential brokers when migrating from `cl.exe` to `clang-cl.exe`.

 * https://github.com/protocolbuffers/protobuf/issues/20085

One thing I noticed is that `rules_cc` as of 0.0.17 doesn't look to offer a `clang-cl` toolchain to build x86 (32-bit) binaries.

https://github.com/bazelbuild/rules_cc/blob/a1162270a0bb680190e8b4f3dab066f15a1ede6c/cc/private/toolchain/BUILD.windows.tpl#L73-L98

It would be really nice if `rules_cc` can provide a `clang-cl` toolchain to build x86 (32-bit) binaries.

	# Hardcoded toolchain, legacy behaviour.
	cc_toolchain_suite(
	name = "toolchain",
	toolchains = {
	"armeabi-v7a\|compiler": ":cc-compiler-armeabi-v7a",
	"x64_windows\|msvc-cl": ":cc-compiler-x64_windows",
	"x64_x86_windows\|msvc-cl": ":cc-compiler-x64_x86_windows",
	"x64_arm_windows\|msvc-cl": ":cc-compiler-x64_arm_windows",
	"x64_arm64_windows\|msvc-cl": ":cc-compiler-arm64_windows",
	"arm64_windows\|msvc-cl": ":cc-compiler-arm64_windows",
	"x64_windows\|msys-gcc": ":cc-compiler-x64_windows_msys",
	"x64_x86_windows\|msys-gcc": ":cc-compiler-x64_x86_windows_msys",
	"x64_windows\|mingw-gcc": ":cc-compiler-x64_windows_mingw",
	"x64_x86_windows\|mingw-gcc": ":cc-compiler-x64_x86_windows_mingw",
	"x64_windows\|clang-cl": ":cc-compiler-x64_windows-clang-cl",
	"x64_windows_msys": ":cc-compiler-x64_windows_msys",
	"x64_windows": ":cc-compiler-x64_windows",
	"x64_x86_windows": ":cc-compiler-x64_x86_windows",
	"x64_arm_windows": ":cc-compiler-x64_arm_windows",
	"x64_arm64_windows": ":cc-compiler-arm64_windows",
	"arm64_windows": ":cc-compiler-arm64_windows",
	"x64_arm64_windows\|clang-cl": ":cc-compiler-arm64_windows-clang-cl",
	"arm64_windows\|clang-cl": ":cc-compiler-arm64_windows-clang-cl",
	"armeabi-v7a": ":cc-compiler-armeabi-v7a",
	},
	)

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`clang-cl` toolchain for x86 (32-bit) binaries is missing #358

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clang-cl toolchain for x86 (32-bit) binaries is missing #358

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`clang-cl` toolchain for x86 (32-bit) binaries is missing #358