Add the majority of machine-level critical edge breaking pass.  Most of this was written by Fernando, cleanup and updating to TOT by me.

This still needs a bit of work, particularly to handle jump tables properly.

llvm-svn: 43885

backing a rewrite buffer than using an std::vector<char>.  This class was hacked
together very quickly and needs to be cleaned up, but it seems to work.  It speeds
up rewriting a a 7M file from 6.43s to 0.24s on my machine.  The impl could also
be made to be a lot more algorithmically sound.

This produces identical output to using vector on this testcase, if it causes a
problems or bugs are encountered, it can be disabled by changing the 
RewriteBuffer::Buffer typedef back.

llvm-svn: 43884

llvm-svn: 43883

llvm-svn: 43882

llvm-svn: 43881

Disable rewrite-tabs.  This speeds up processing of the commentified huge
crazy testcase steve gave me from 20s to 6.6s in a release build.

llvm-svn: 43880

first thing in the file.

The trick is that text replacement should go after the insert point, 
not before it, because it will be replacing text after the point, not before 
it.

llvm-svn: 43879

llvm-svn: 43869

llvm-svn: 43868

llvm-svn: 43867

llvm-svn: 43866

subexpressions) all together in one block at the end.

llvm-svn: 43862

llvm-svn: 43861

llvm-svn: 43860

struct { char a; short b:2; };

llvm-svn: 43859

llvm-svn: 43858

llvm-svn: 43857

array of pointers to not allocate a second array to contain the pointer ids.

Fixed bug in the same member function where deserialized pointers were
not being registered with the backpatcher.

llvm-svn: 43855

llvm-svn: 43854

dereference.

llvm-svn: 43853

an array of pointers of the same type.

llvm-svn: 43852

Added "using ..." for "Serializer" and "Deserializer" to reduce amount
of typing for serialization methods.

llvm-svn: 43849

llvm-svn: 43848

llvm-svn: 43847

BatchEmitOwnedPtrs() and BatchReadOwnedPtrs() methods.

Modified serialization of all Stmts to start their own record in the bitstream.

llvm-svn: 43846

to group the pointer IDs together in the bitstream before their referenced
contents (which will lend itself to more efficient encoding).

llvm-svn: 43845

Would somebody not on Darwin please make sure this
doesn't break anything.  Exception handling failures
would be the most likely symptom.

llvm-svn: 43844

llvm-svn: 43843

llvm-svn: 43839

llvm-svn: 43838

llvm-svn: 43837

llvm-svn: 43836

llvm-svn: 43834

llvm-svn: 43833

llvm-svn: 43832

Finishing touches on code generation for @try and friends.

- declare functions we use.
- cast arguments to objc_exception_match().
- don't take the & of _stack.buf.

llvm-svn: 43831

llvm-svn: 43830

llvm-svn: 43829

llvm-svn: 43828

Remove old asserts from ASTContext::isObjcIdType() and isObjcClassType(). Instead, return false if the declarations aren't in scope. This was a hold over from when 'id' and 'Class' were initialized lazily.

llvm-svn: 43827