riscv: big rewrite to use latest liveness

this one is even harder to document then the last large overhaul.

TLDR;
- split apart Emit.zig into an Emit.zig and a Lower.zig
- created seperate files for the encoding, and now adding a new instruction
is as simple as just adding it to a couple of switch statements and providing the encoding.
- relocs are handled in a more sane maner, and we have a clear defining boundary between
lea_symbol and load_symbol now.
- a lot of different abstractions for things like the stack, memory, registers, and others.
- we're using x86_64's FrameIndex now, which simplifies a lot of the tougher design process.
- a lot more that I don't have the energy to document. at this point, just read the commit itself :p

1 files changed, 1 insertions, 2 deletions

diff --git a/lib/std/start.zig b/lib/std/start.zig
index 0228ffdc2b..5fad443956 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -208,8 +208,7 @@ fn wasi_start() callconv(.C) void {
 }
 
 fn riscv_start() callconv(.C) noreturn {
-    const code = @call(.always_inline, callMain, .{});
-    std.process.exit(code);
+    std.process.exit(@call(.always_inline, callMain, .{}));
 }
 
 fn EfiMain(handle: uefi.Handle, system_table: *uefi.tables.SystemTable) callconv(.C) usize {