[power7-meissner] Patches to build glibc, fix some testsuite errors, cleanup, add vector alignment

[Michael Meissner <meissner at linux dot vnet dot ibm dot com>]

Today's patches turn off expanding 'vector' or '__vector' if the next token is
not an identifier, which will allow glibc to build the writev function (which
uses __vector in the prototype, and vector in the function body).  I to tend to
agree that the conditional macro support is kind of shakey.

I removed the call to unsigned_condition in rs6000_emit_vector_cond_expr, since
it flags an error for some inputs, and instead handled the comparisons we want
directly.

I added vector realignment support, but it isn't stable enough to enable its
use in the testsuite.

I also moved some insns around and did cleanup.

-- 
Michael Meissner, IBM
4 Technology Place Drive, MS 2203A, Westford, MA, 01886, USA
meissner@linux.vnet.ibm.com

Attachment: gcc-power7.patch39
Description: Text document