Fix memory leak in the stackifier, due to the machinebasicblocks not holding
instructions on an ilist

llvm-svn: 10556
diff --git a/llvm/lib/Target/X86/FloatingPoint.cpp b/llvm/lib/Target/X86/FloatingPoint.cpp
index 7bc1f72..b893476 100644
--- a/llvm/lib/Target/X86/FloatingPoint.cpp
+++ b/llvm/lib/Target/X86/FloatingPoint.cpp
@@ -601,6 +601,7 @@
   }
 
   I = MBB->erase(I)-1;  // Remove the pseudo instruction
+  delete MI;
 }
 
 namespace {