Gets rust running rv64iM

bench/programs_rust/.cargo/config.toml

@@ -2,13 +2,14 @@
 target = "riscv64i.json"
 
 [target.riscv64i]
-linker = "riscv64-unknown-elf-ld"
-# linker = "rust-lld"
+#linker = "riscv64-unknown-elf-ld"
+linker = "ld.lld"
 
 rustflags = [
     # "-C", "link-arg=-nostartfiles",
     "-C", "link-arg=-T../link.ld",
     "-C", "link-arg=../mem/crt.o",
+    "-C", "target-feature=+m",
 ]
 
 [unstable]

bench/programs_rust/riscv64i.json

@@ -9,9 +9,9 @@
     "os": "none",
     "vendor": "unknown",
     "env": "",
-    "features": "+i",
-    "linker-flavor": "ld.lld",
-    "linker": "riscv64-unknown-elf-ld",
+    "features": "+i,+m",
+    "linker": "ld.lld",
+    "linker-flavor": "ld",
     "executables": true,
     "panic-strategy": "abort",
     "relocation-model": "static",