A few bug fixes; some improvements spurred by paper writing

Among others:
- Fixed Stg->C-- translation of let-no-escapes -- it's important to use the
  right continuation...
- Fixed infinite recursion in X86 backend (shortcutJump mishandled infinite loops)
- Fixed yet another wrong calling convention -- primops take args only in vanilla regs,
  but they may return results on the stack!
- Removed StackInfo from LGraph and Block -- now in LastCall and CmmZ
- Updated avail-variable and liveness code

1 files changed, 1 insertions, 1 deletions

diff --git a/validate b/validate
index 5d0afb4d2b..4e2352b9cb 100644
--- a/validate
+++ b/validate
@@ -48,7 +48,7 @@ done
 if [ "$CPUS" = "" ]; then
     threads=2
 else
-    threads=`expr $CPUS + 1`
+    threads=$((($CPUS + 1) * 2)) # `expr $CPUS + 1`
 fi
 
 if [ $testsuite_only -eq 0 ]; then