Backport: Reduce number of used unstable features of x86_64 crate

Author: phil-opp

Cargo.toml

@@ -14,7 +14,7 @@ required-features = ["binary"]
 
 [dependencies]
 xmas-elf = { version = "0.6.2", optional = true }
-x86_64 = { version = "0.13.2", optional = true }
+x86_64 = { version = "0.13.2", optional = true, default-features = false, features = ["instructions", "inline_asm"] }
 usize_conversions = { version = "0.2.0", optional = true }
 fixedvec = { version = "0.2.4", optional = true }
 bit_field = { version = "0.10.0", optional = true }

example-kernel/Cargo.toml

@@ -5,4 +5,4 @@ authors = ["Philipp Oppermann <dev@phil-opp.com>"]
 edition = "2018"
 
 [dependencies]
-x86_64 = "0.13.2"
+x86_64 = { version = "0.13.2", default-features = false, features = ["instructions", "inline_asm"] }

test-kernel/Cargo.toml

@@ -5,4 +5,4 @@ authors = ["Philipp Oppermann <dev@phil-opp.com>"]
 edition = "2018"
 
 [dependencies]
-x86_64 = "0.13.2"
+x86_64 = { version = "0.13.2", default-features = false, features = ["instructions", "inline_asm"] }