Revert [ARM/FDPIC v6 13/24] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture

This is causing regressions when mixing with user code compiled in ARM mode.

2019-09-20  Christophe Lyon  <christophe.lyon@st.com>

	Revert:
	2019-09-10  Christophe Lyon  <christophe.lyon@st.com>
		Mickaël Guêné <mickael.guene@st.com>

	* config/arm/unwind-arm.c (_Unwind_VRS_Set): Handle thumb-only
	architecture.

From-SVN: r276001

libgcc/ChangeLog

+2019-09-20  Christophe Lyon  <christophe.lyon@st.com>
+
+	Revert:
+	2019-09-10  Christophe Lyon  <christophe.lyon@st.com>
+		Mickaël Guêné <mickael.guene@st.com>
+
+	* config/arm/unwind-arm.c (_Unwind_VRS_Set): Handle thumb-only
+	architecture.
+
 2019-09-19  Richard Henderson  <richard.henderson@linaro.org>
 
 	* config/aarch64/lse-init.c: New file.

libgcc/config/arm/unwind-arm.c

@@ -199,11 +199,6 @@ _Unwind_VRS_Result _Unwind_VRS_Set (_Unwind_Context *context,
 	return _UVRSR_FAILED;
 
       vrs->core.r[regno] = *(_uw *) valuep;
-#if defined(__thumb__)
-      /* Force LSB bit since we always run thumb code.  */
-      if (regno == R_PC)
-	vrs->core.r[regno] |= 1;
-#endif
       return _UVRSR_OK;
 
     case _UVRSC_VFP: