[XS] Change in coreboot[main]: src/arch/x86/c_start: Delete duplicated code masking stack pointer

[NyeonWoo Kim (Code Review)]

NyeonWoo Kim has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/87181?usp=email )

Change subject: src/arch/x86/c_start: Delete duplicated code masking stack pointer
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src/arch/x86/c_start: Delete duplicated code masking stack pointer

I found duplicated code masking stack pointer.

So, i'd like to remove the duplicate for refactoring :-).

This is my build output of c_start.o, before vs after modifying.
  before modifying
    ...
    44:   f3 ab                   rep stos %eax,%es:(%edi)
    46:   bc 00 00 00 00          mov    $0x0,%esp
    4b:   83 e4 f0                and    $0xfffffff0,%esp
    4e:   b0 6e                   mov    $0x6e,%al
    50:   e6 80                   out    %al,$0x80
    52:   83 e4 f0                and    $0xfffffff0,%esp  // deleted.
    55:   e8 fc ff ff ff          call   56 <_start+0x56>
    ...
  after modifying
    ...
    44:   f3 ab                   rep stos %eax,%es:(%edi)
    46:   bc 00 00 00 00          mov    $0x0,%esp
    4b:   83 e4 f0                and    $0xfffffff0,%esp
    4e:   b0 6e                   mov    $0x6e,%al
    50:   e6 80                   out    %al,$0x80
    52:   e8 fc ff ff ff          call   53 <_start+0x53>
    ...

Change-Id: I417ce90279fea4b00432e6a209f77a6dd0c0fee6
Signed-off-by: NyeonWoo Kim 
---
M src/arch/x86/c_start.S
1 file changed, 0 insertions(+), 7 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/81/87181/1

diff --git a/src/arch/x86/c_start.S b/src/arch/x86/c_start.S
index 94b9bd9..fd61cab4 100644
--- a/src/arch/x86/c_start.S
+++ b/src/arch/x86/c_start.S
@@ -101,13 +101,6 @@
     */
    post_code(POSTCODE_PRE_HARDWAREMAIN)	/* post 6e */

-#if ENV_X86_64
-	movq	$0xFFFFFFFFFFFFFFF0, %rax
-	and	%rax, %rsp
-#else
-	andl	$0xFFFFFFF0, %esp
-#endif
-
 #if CONFIG(ASAN_IN_RAMSTAGE)
    call asan_init
 #endif