rustc_mir: compute all the qualification bits separately in qualify_consts.

Author: eddyb

Cargo.lock

@@ -2822,7 +2822,6 @@ name = "rustc_mir"
 version = "0.0.0"
 dependencies = [
  "arena 0.0.0",
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "graphviz 0.0.0",

src/librustc_mir/Cargo.toml

@@ -11,7 +11,6 @@ crate-type = ["dylib"]
 
 [dependencies]
 arena = { path = "../libarena" }
-bitflags = "1.0"
 either = "1.5.0"
 dot = { path = "../libgraphviz", package = "graphviz" }
 log = "0.4"