[RISCV] Support constraint "s" (#80201)

GCC has supported a generic constraint "s" for a long time (since at
least 1992), which references a symbol or label with an optional
constant offset. "i" is a superset that also supports a constant
integer.

GCC's RISC-V port also supports a machine-specific constraint "S",
which cannot be used with a preemptible symbol. (We don't bother to
check preemptibility.) In PIC code, an external symbol is preemptible by
default, making "S" less useful if you want to create an artificial
reference for linker garbage collection, or define sections to hold
symbol addresses:

```
void fun();
// error: impossible constraint in ‘asm’ for riscv64-linux-gnu-gcc -fpie/-fpic
void foo() { asm(".reloc ., BFD_RELOC_NONE, %0" :: "S"(fun)); }
// good even if -fpie/-fpic
void foo() { asm(".reloc ., BFD_RELOC_NONE, %0" :: "s"(fun)); }
```

This patch adds support for "s". Modify https://reviews.llvm.org/D105254
("S") to handle multi-depth GEPs (https://reviews.llvm.org/D61560).

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 7a7ddc5..3648ea2 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -5075,7 +5075,7 @@ Some constraint codes are typically supported by all targets:
 - ``i``: An integer constant (of target-specific width). Allows either a simple
   immediate, or a relocatable value.
 - ``n``: An integer constant -- *not* including relocatable values.
-- ``s``: An integer constant, but allowing *only* relocatable values.
+- ``s``: A symbol or label reference with a constant offset.
 - ``X``: Allows an operand of any kind, no constraint whatsoever. Typically
   useful to pass a label for an asm branch or call.
 
@@ -5283,6 +5283,7 @@ RISC-V:
 - ``f``: A 32- or 64-bit floating-point register (requires F or D extension).
 - ``r``: A 32- or 64-bit general-purpose register (depending on the platform
   ``XLEN``).
+- ``S``: Alias for ``s``.
 - ``vr``: A vector register. (requires V extension).
 - ``vm``: A vector register for masking operand. (requires V extension).