[clang][CodeGen] Move WebAssembly specific tests to WebAssembly subtarget folder

Minor cleanup to move more target specific tests out of the root codegen test folder

diff --git a/clang/test/CodeGen/wasm-arguments.c b/clang/test/CodeGen/WebAssembly/wasm-arguments.c
similarity index 100%
rename from clang/test/CodeGen/wasm-arguments.c
rename to clang/test/CodeGen/WebAssembly/wasm-arguments.c

diff --git a/clang/test/CodeGen/wasm-call-main.c b/clang/test/CodeGen/WebAssembly/wasm-call-main.c
similarity index 100%
rename from clang/test/CodeGen/wasm-call-main.c
rename to clang/test/CodeGen/WebAssembly/wasm-call-main.c

diff --git a/clang/test/CodeGen/wasm-export-name.c b/clang/test/CodeGen/WebAssembly/wasm-export-name.c
similarity index 100%
rename from clang/test/CodeGen/wasm-export-name.c
rename to clang/test/CodeGen/WebAssembly/wasm-export-name.c

diff --git a/clang/test/CodeGen/wasm-import-module.c b/clang/test/CodeGen/WebAssembly/wasm-import-module.c
similarity index 100%
rename from clang/test/CodeGen/wasm-import-module.c
rename to clang/test/CodeGen/WebAssembly/wasm-import-module.c

diff --git a/clang/test/CodeGen/wasm-import-name.c b/clang/test/CodeGen/WebAssembly/wasm-import-name.c
similarity index 100%
rename from clang/test/CodeGen/wasm-import-name.c
rename to clang/test/CodeGen/WebAssembly/wasm-import-name.c

diff --git a/clang/test/CodeGen/wasm-main.c b/clang/test/CodeGen/WebAssembly/wasm-main.c
similarity index 100%
rename from clang/test/CodeGen/wasm-main.c
rename to clang/test/CodeGen/WebAssembly/wasm-main.c

diff --git a/clang/test/CodeGen/wasm-main_argc_argv.c b/clang/test/CodeGen/WebAssembly/wasm-main_argc_argv.c
similarity index 100%
rename from clang/test/CodeGen/wasm-main_argc_argv.c
rename to clang/test/CodeGen/WebAssembly/wasm-main_argc_argv.c

diff --git a/clang/test/CodeGen/wasm-regparm.c b/clang/test/CodeGen/WebAssembly/wasm-regparm.c
similarity index 100%
rename from clang/test/CodeGen/wasm-regparm.c
rename to clang/test/CodeGen/WebAssembly/wasm-regparm.c

diff --git a/clang/test/CodeGen/wasm-varargs.c b/clang/test/CodeGen/WebAssembly/wasm-varargs.c
similarity index 100%
rename from clang/test/CodeGen/wasm-varargs.c
rename to clang/test/CodeGen/WebAssembly/wasm-varargs.c