'&&' clang commands together so that the test status reflects the results of all three clang executions.

llvm-svn: 53132

Update test case:  simply running "clang -checker-simple" doesn't invoke the dead store checker anymore.  We need "-warn-dead-stores" as well.

llvm-svn: 53055

llvm-svn: 52568

1) Check if a dead store appears as a subexpression.  For such cases, we emit
   a verbose diagnostic so that users aren't confused.  This addresses:
   
   <rdar://problem/5968508> checker gives misleading report for dead store in loop
   
2) Don't emit a dead store warning when assigning a null value to a pointer.
   This is a common form of defensive programming.  We may wish to make
   this an option to the the checker one day.
   
   This addresses the feature request in the following email:
   
   http://lists.cs.uiuc.edu/pipermail/cfe-dev/2008-June/001978.html

llvm-svn: 52555

llvm-svn: 51395

llvm-svn: 50679

llvm-svn: 49735

llvm-svn: 49647

llvm-svn: 48539

llvm-svn: 44305

block-level expressions are evaluated the same as regular expressions. Test
case provided by Nuno Lopes.

llvm-svn: 44247

for correct propagation/update of liveness information within subexpressions
of Block-Level expressions.  Test case provided by Nuno Lopes.

llvm-svn: 44225

llvm-svn: 44221