[gcc r12-8068] loongarch: testsuite: adapt stack-usage-1.c for LP64

[Xi Ruoyao <xry111@gcc.gnu.org>]

https://gcc.gnu.org/g:c8f7324e81c1bb7093a5b44317af385e5774f9a3

commit r12-8068-gc8f7324e81c1bb7093a5b44317af385e5774f9a3
Author: Xi Ruoyao <xry111@mengyan1223.wang>
Date:   Sat Apr 9 01:58:40 2022 +0800

    loongarch: testsuite: adapt stack-usage-1.c for LP64
    
    LoongArch backend allocates two additional 8-byte stack slots for LP64,
    one for saving $fp and another for saving the temporary value "1".
    Ideally they are both unneeded, but (1) we're using -O0 so the code is
    suboptimized by the nature; (2) any improvement (if possible) should be
    deferred to GCC 13.  So for now simply adjust the test to make it pass.
    
    gcc/testsuite/
    
            * gcc.dg/stack-usage-1.c: Adjust for LoongArch LP64.

Diff:
---
 gcc/testsuite/gcc.dg/stack-usage-1.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/stack-usage-1.c b/gcc/testsuite/gcc.dg/stack-usage-1.c
index 1d7d1fee435..21cce0f440c 100644
--- a/gcc/testsuite/gcc.dg/stack-usage-1.c
+++ b/gcc/testsuite/gcc.dg/stack-usage-1.c
@@ -105,6 +105,8 @@
 #  define SIZE 252
 #elif defined (__CRIS__)
 #  define SIZE 252
+#elif defined (__loongarch_lp64)
+#  define SIZE 240   /* 256 - 8 bytes for $fp, and 8 bytes for a temp value */
 #else
 #  define SIZE 256
 #endif