Fixes bug 22811465 - math:exp() throws badarith exception on SPARC

Fix was recommended by upstream Erlang/OTP team and is being applied to trunk.

--- otp_src_17.5-ORIG/erts/emulator/sys/ose/sys_float.c	2016-04-19 13:16:27.190731082 +0100

+++ otp_src_17.5/erts/emulator/sys/ose/sys_float.c	2016-04-19 13:18:30.669678699 +0100

@@ -835,10 +835,5 @@

 int

 matherr(struct exception *exc)

 {

-#if !defined(NO_FPE_SIGNALS)

-    volatile unsigned long *fpexnp = erts_get_current_fp_exception();

-    if (fpexnp != NULL)

-	*fpexnp = (unsigned long)__builtin_return_address(0);

-#endif

     return 1;

 }

--- otp_src_17.5-ORIG/erts/emulator/sys/unix/sys_float.c	2016-04-19 13:16:27.187000925 +0100

+++ otp_src_17.5/erts/emulator/sys/unix/sys_float.c	2016-04-19 13:18:22.503799817 +0100

@@ -837,11 +837,6 @@

 int

 matherr(struct exception *exc)

 {

-#if !defined(NO_FPE_SIGNALS)

-    volatile unsigned long *fpexnp = erts_get_current_fp_exception();

-    if (fpexnp != NULL)

-	*fpexnp = (unsigned long)__builtin_return_address(0);

-#endif

     return 1;

 }

--- otp_src_17.5-ORIG/erts/emulator/sys/win32/sys_float.c	2016-04-19 13:16:27.187779815 +0100

+++ otp_src_17.5/erts/emulator/sys/win32/sys_float.c	2016-04-19 13:19:05.229444947 +0100

@@ -138,8 +138,7 @@

 int

 matherr(struct _exception *exc)

 {

-    erl_fp_exception = 1;

-    DEBUGF(("FP exception (matherr) (0x%x) (%d)\n", exc->type, erl_fp_exception));

+    DEBUGF(("FP exception (matherr) (0x%x)\n", exc->type));

     return 1;

 }