fix Xtensa branch relaxation bug

[Bob Wilson]

The MAX_IMMED6 macro used to determine if a short Xtensa branch is in range had 
an incorrect value that caused the assembler to hit an assertion failure.  I've 
included a new test for this.  Committed on mainline.

gas/
         * config/tc-xtensa.c (MAX_IMMED6): Change value to 65.

gas/testsuite/
         * gas/xtensa/short_branch_offset.s: New.
         * gas/xtensa/short_branch_offset.d: New.
         * gas/xtensa/all.exp: Run new test.

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