[Driver] Add -fno-split-stack

Summary: Add -fno-split-stack and rename CC1 option from `-split-stacks`
to `-fsplit-stack`.

Test Plan: check-all

Differential Revision: https://reviews.llvm.org/D99245

Author: ChuanqiXu9

clang/include/clang/Driver/Options.td

@@ -2377,7 +2377,10 @@ defm signed_char : BoolFOption<"signed-char",
   LangOpts<"CharIsSigned">, DefaultTrue,
   NegFlag<SetFalse, [CC1Option], "char is unsigned">, PosFlag<SetTrue, [], "char is signed">>,
   ShouldParseIf<!strconcat("!", open_cl.KeyPath)>;
-def fsplit_stack : Flag<["-"], "fsplit-stack">, Group<f_Group>;
+defm split_stack : BoolFOption<"split-stack",
+  CodeGenOpts<"EnableSegmentedStacks">, DefaultFalse,
+  NegFlag<SetFalse, [], "Wouldn't use segmented stack">, 
+  PosFlag<SetTrue, [CC1Option], "Use segmented stack">>;
 def fstack_protector_all : Flag<["-"], "fstack-protector-all">, Group<f_Group>,
   HelpText<"Enable stack protectors for all functions">;
 defm stack_clash_protection : BoolFOption<"stack-clash-protection",
@@ -4754,9 +4757,6 @@ def mtp : Separate<["-"], "mtp">,
 def mlimit_float_precision : Separate<["-"], "mlimit-float-precision">,
   HelpText<"Limit float precision to the given value">,
   MarshallingInfoString<CodeGenOpts<"LimitFloatPrecision">>;
-def split_stacks : Flag<["-"], "split-stacks">,
-  HelpText<"Try to use a split stack if possible.">,
-  MarshallingInfoFlag<CodeGenOpts<"EnableSegmentedStacks">>;
 def mregparm : Separate<["-"], "mregparm">,
   HelpText<"Limit the number of registers available for integer arguments">,
   MarshallingInfoInt<CodeGenOpts<"NumRegisterParameters">>;

clang/lib/Driver/ToolChains/Clang.cpp

@@ -4873,8 +4873,9 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                   options::OPT_fno_experimental_relative_cxx_abi_vtables);
 
   // Handle segmented stacks.
-  if (Args.hasArg(options::OPT_fsplit_stack))
-    CmdArgs.push_back("-split-stacks");
+  if (Args.hasFlag(options::OPT_fsplit_stack, options::OPT_fno_split_stack,
+                   false))
+    CmdArgs.push_back("-fsplit-stack");
 
   RenderFloatingPointOptions(TC, D, OFastEnabled, Args, CmdArgs, JA);
 

clang/test/Driver/clang_f_opts.c

@@ -3,7 +3,7 @@
 // RUN: %clang -### -S -fasm -fblocks -fbuiltin -fno-math-errno -fcommon -fpascal-strings -fno-blocks -fno-builtin -fmath-errno -fno-common -fno-pascal-strings -fblocks -fbuiltin -fmath-errno -fcommon -fpascal-strings -fsplit-stack %s 2>&1 | FileCheck -check-prefix=CHECK-OPTIONS1 %s
 // RUN: %clang -### -S -fasm -fblocks -fbuiltin -fno-math-errno -fcommon -fpascal-strings -fno-asm -fno-blocks -fno-builtin -fmath-errno -fno-common -fno-pascal-strings -fno-show-source-location -fshort-enums %s 2>&1 | FileCheck -check-prefix=CHECK-OPTIONS2 %s
 
-// CHECK-OPTIONS1: -split-stacks
+// CHECK-OPTIONS1: -fsplit-stack
 // CHECK-OPTIONS1: -fgnu-keywords
 // CHECK-OPTIONS1: -fblocks
 // CHECK-OPTIONS1: -fpascal-strings