ia64: define nocancel entry points in PSEUDO

The previous set of not-cancel.h headers (prior to the commit
2fbdf5339a) did not require the
arch to define nocancel entry points, so ia64 never did.
However, after the various files were merged, it became a hard
requirement for arches which mean ia64 failed to build.

Here we add dedicated entry points.  It'd be nice to merge
with the existing stubs like other arches do, but the ia64
asm does not lend itself to interleaving of functions.  If
someone has a suggestion on merging these, that'd be great,
but at least now we build & pass tests again.

sysdeps/unix/sysv/linux/ia64/sysdep-cancel.h

@@ -121,6 +121,25 @@ ENTRY (name)								      \
 (p6) br.cond.spnt.few __syscall_error;					      \
      ret;;								      \
      .endp name;							      \
+									      \
+      .proc __##syscall_name##_nocancel;				      \
+     .globl __##syscall_name##_nocancel;				      \
+__##syscall_name##_nocancel:						      \
+     .prologue;								      \
+     adds r2 = SYSINFO_OFFSET, r13;					      \
+     .save ar.pfs, r11;							      \
+     mov r11 = ar.pfs;;							      \
+     .body;								      \
+     ld8 r2 = [r2];							      \
+     mov r15 = SYS_ify(syscall_name);;					      \
+     mov b7 = r2;							      \
+     br.call.sptk.many b6 = b7;;					      \
+     mov ar.pfs = r11;							      \
+     cmp.eq p6,p0 = -1, r10;						      \
+(p6) br.cond.spnt.few __syscall_error;					      \
+     ret;;								      \
+     .endp __##syscall_name##_nocancel;					      \
+									      \
      .proc __GC_##name;							      \
      .globl __GC_##name;						      \
      .hidden __GC_##name;						      \