[PATCH, testsuite] Add dg-require-stack-size

[Tom de Vries]

Hi,

I noticed gcc.dg/tree-ssa/ldist-27.c failing for nvptx due to a too 
large stack size.

I started updating the testcase using "dg-add-options stack_size", but 
came across dg-require-support and realized I could make a 
dg-require-stack-size directive with an argument, and use that instead.

With the patch applied, the test still passes on x86_64, and by mocking 
up limited stack space like this:
...
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 4f9bf46..cafea26 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -511,6 +511,7 @@ proc check_effective_target_trampolines { } {
  # Return 1 if target has limited stack size.

  proc check_effective_target_stack_size { } {
+    return 1
      if [target_info exists gcc,stack_size] {
         return 1
      }
@@ -522,6 +523,7 @@ proc check_effective_target_stack_size { } {
  proc dg-effective-target-value { effective_target } {
      if { "$effective_target" == "stack_size" } {
         if [check_effective_target_stack_size] {
+           return 8192
             return [target_info gcc,stack_size]
         }
      }
...
it's listed as unsupported instead.

The info entry looks like:
...
'dg-require-stack-size SIZE'
      Skip the test if the target does not support a stack size of SIZE.
...

OK for trunk?

Thanks,
- Tom
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