Remove unused dependencies from rustc_const_eval

Author: camsteffen

Cargo.lock

@@ -3736,8 +3736,6 @@ dependencies = [
 name = "rustc_const_eval"
 version = "0.0.0"
 dependencies = [
- "either",
- "gsgdt",
  "rustc_apfloat",
  "rustc_ast",
  "rustc_attr",

compiler/rustc_const_eval/Cargo.toml

@@ -7,8 +7,6 @@ edition = "2021"
 doctest = false
 
 [dependencies]
-either = "1.5.0"
-gsgdt = "0.1.2"
 tracing = "0.1"
 rustc_apfloat = { path = "../rustc_apfloat" }
 rustc_ast = { path = "../rustc_ast" }