Remove split-stack from backend

The backend was derived from the go backend which enables split stack
support by default. This inserts a __morestack call at the start of
each function. This is not needed for the rust backend. Remove the
split stack support code from the rust backend and spec.

1 files changed, 4 insertions, 8 deletions

diff --git a/gcc/rust/rust-backend.h b/gcc/rust/rust-backend.h
index 4635796..1af76cf 100644
--- a/gcc/rust/rust-backend.h
+++ b/gcc/rust/rust-backend.h
@@ -790,27 +790,23 @@ public:
   // recover and must be visible for correct panic recovery.
   static const unsigned int function_is_inlinable = 1 << 2;
 
-  // Set if the function may not split the stack.  This is set for the
-  // implementation of recover itself, among other things.
-  static const unsigned int function_no_split_stack = 1 << 3;
-
   // Set if the function does not return.  This is set for the
   // implementation of panic.
-  static const unsigned int function_does_not_return = 1 << 4;
+  static const unsigned int function_does_not_return = 1 << 3;
 
   // Set if the function should be put in a unique section if
   // possible.  This is used for field tracking.
-  static const unsigned int function_in_unique_section = 1 << 5;
+  static const unsigned int function_in_unique_section = 1 << 4;
 
   // Set if the function should be available for inlining in the
   // backend, but should not be emitted as a standalone function.  Any
   // call to the function that is not inlined should be treated as a
   // call to a function defined in a different compilation unit.  This
   // is like a C99 function marked inline but not extern.
-  static const unsigned int function_only_inline = 1 << 6;
+  static const unsigned int function_only_inline = 1 << 5;
 
   // const function
-  static const unsigned int function_read_only = 1 << 7;
+  static const unsigned int function_read_only = 1 << 6;
 
   // Declare or define a function of FNTYPE.
   // NAME is the Go name of the function.  ASM_NAME, if not the empty