[RX] Fix for Bug 22737

[Oleg Endo]

Hi,

This is the updated patch now with GAS test case and ChangeLog entry.

Tested with "make check" before and after the patch to make sure that
the testcase actually works.

Cheers,
Oleg

gas/ChangeLog:
	PR 22737
	* config/tc-rx.c (rx_start_line): Handle escaped double-quote character.
	* testsuite/gas/rx/pr22737.s: New test.
	* testsuite/gas/rx/pr22737.d: Likewise.
	* testsuite/gas/rx/rx.exp: Likewise.
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