add -nobounds (similar to -gcflags=-B)

compiler/compiler.go

@@ -58,6 +58,7 @@ type Config struct {
 	MaxStackAlloc      uint64
 	NeedsStackObjects  bool
 	Debug              bool // Whether to emit debug information in the LLVM module.
+	Nobounds           bool // Whether to skip bounds checks
 	PanicStrategy      string
 }
 

compiler/symbol.go

@@ -438,6 +438,10 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 			}
 		}
 	}
+
+	if c.Nobounds {
+		info.nobounds = true
+	}
 }
 
 // Check whether this function can be used in //go:wasmimport or