PR85532, crtend.o built without --enable-initfini-array has bad .eh_frame

	PR libgcc/85532
	* config/rs6000/t-crtstuff (CRTSTUFF_T_CFLAGS): Add
	-fno-asynchronous-unwind-tables.

From-SVN: r259702

libgcc/ChangeLog

+2018-04-27  Alan Modra  <amodra@gmail.com>
+
+	PR libgcc/85532
+	* config/rs6000/t-crtstuff (CRTSTUFF_T_CFLAGS): Add
+	-fno-asynchronous-unwind-tables.
+
 2018-04-25  Chung-Ju Wu  <jasonwucj@gmail.com>
 
 	* config/nds32/sfp-machine.h: Fix settings for NDS32_ABI_2FP_PLUS.

libgcc/config/rs6000/t-crtstuff

@@ -3,4 +3,4 @@
 # Do not build crtend.o with -Os as that can result in references to
 # out-of-line register save/restore functions, which may be unresolved
 # as crtend.o is linked after libgcc.a.  See PR45053.
-CRTSTUFF_T_CFLAGS = -msdata=none -O2
+CRTSTUFF_T_CFLAGS = -msdata=none -O2 -fno-asynchronous-unwind-tables