clang as a Release build.

The big change is that all AST nodes (subclasses of Stmt) whose children are
Expr* store their children as Stmt* or arrays of Stmt*. This is to remove
strict-aliasing warnings when using StmtIterator. None of the interfaces of any
of the classes have changed (except those with arg_iterators, see below), as the
accessor methods introduce the needed casts (via cast<>). While this extra
casting may seem cumbersome, it actually adds some important sanity checks
throughout the codebase, as clients using StmtIterator can potentially overwrite
children that are expected to be Expr* with Stmt* (that aren't Expr*). The casts
provide extra sanity checks that are operational in debug builds to catch
invariant violations such as these.

For classes that have arg_iterators (e.g., CallExpr), the definition of
arg_iterator has been replaced. Instead of it being Expr**, it is an actual
class (called ExprIterator) that wraps a Stmt**, and provides the necessary
operators for iteration. The nice thing about this class is that it also uses
cast<> to type-checking, which introduces extra sanity checks throughout the
codebase that are useful for debugging.

A few of the CodeGen functions that use arg_iterator (especially from
OverloadExpr) have been modified to take begin and end iterators instead of a
base Expr** and the number of arguments. This matches more with the abstraction
of iteration. This still needs to be cleaned up a little bit, as clients expect
that ExprIterator is a RandomAccessIterator (which we may or may not wish to
allow for efficiency of representation).

This is a fairly large patch. It passes the tests (except CodeGen/bitfield.c,
which was already broken) on both a Debug and Release build, but it should
obviously be reviewed.

llvm-svn: 52378

Rather than avoiding to wrap ISD::DECLARE GV operand in X86ISD::Wrapper, simply handle it at dagisel time with x86 specific isel code.

llvm-svn: 52377

llvm-svn: 52376

llvm-svn: 52375

llvm-svn: 52374

llvm-svn: 52373

Add color diagnostics from scan-build, and indicate the number of bugs found (if any).

llvm-svn: 52372

when changing the stride of a comparison so that it's slightly
more precise, by having it scan the instruction list to determine
if there is a use of the condition after the point where the
condition will be inserted.

llvm-svn: 52371

llvm-svn: 52370

llvm-svn: 52367

llvm-svn: 52366

this speeds up the linking testcase in PR1860 by 44% (.379 -> 0.263)

llvm-svn: 52365

llvm-svn: 52364

llvm-svn: 52363

llvm-svn: 52362

llvm-svn: 52361

llvm-svn: 52360

llvm-svn: 52359

a vector with a linear search.  This speeds up the linking testcase 
in PR1860 from 0.965s to 0.385s on my system.

llvm-svn: 52357

Move NSString.m test case from Analysis-Apple to Analysis.  The test case now works on all platforms.

llvm-svn: 52354

- Add "Commutative" property to intrinsics. This allows tblgen to generate the commuted variants for dagisel matching code.
- Mark lots of X86 intrinsics as "Commutative" to allow load folding.

llvm-svn: 52353

llvm-svn: 52352

llvm-svn: 52351

llvm-svn: 52350

llvm-svn: 52349

llvm-svn: 52348

the testcases in PR1860 from taking more than 1 hour (when I killed it)
to taking 1s.

llvm-svn: 52347

llvm-svn: 52346

llvm-svn: 52345

llvm-svn: 52344

Moved CFDate.m from test/Analysis-Apple to test/Analysis, and added the necessary declarations from Foundation.h to CFDate.m so that the test case can be exercised on all platforms.

llvm-svn: 52343

llvm-svn: 52341

client that cares and simplifying its control flow.

Remove the DestST argument to ResolveTypes and RecursiveResolveTypes*
which are dead now.

llvm-svn: 52340

llvm-svn: 52339

ResolveTypes into the one place that needs it.

llvm-svn: 52338

llvm-svn: 52337

Patch by Nikita Zhuk!

llvm-svn: 52336

a JIT client to completely control symbol lookup with the LazyFunctionCreator
interface.

llvm-svn: 52335

This fixes use of alloca on 64-bit systems.

llvm-svn: 52334

Patch by Gary Benson!

llvm-svn: 52332