PNaCl wire format: Remove function attributes from pexe reader/writer

Remove support for reading and writing the PARAMATTR_BLOCK_ID and
PARAMATTR_GROUP_BLOCK_ID blocks.

These blocks will no longer be written into pexes.  While PNaCl
doesn't allow function attributes on normal functions,
Function::Create() always inserts them back on intrinsics, so
previously the PARAMATTR blocks were being written into pexes.

Remove paramattr fields from two record types:

 * MODULE_CODE_FUNCTION records (function declarations).  Also remove
   the fields that follow paramattr, which PNaCl also does not use.

 * FUNC_CODE_INST_CALL (function calls).

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3506
TEST=PNaCl toolchain trybots + GCC torture tests + Spec2k

Review URL: https://codereview.chromium.org/17419013

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