fix(es/minifier): Only cast global Infinity/undefined/NaN (#7684)

**Related issue:**

 - Closes #7683.

crates/swc_ecma_minifier/tests/fixture/issues/7683/1/input.js

@@ -0,0 +1,23 @@
+{
+    let Infinity = 3;
+    console.log(Infinity);
+    if (Infinity > 4) console.log("Infinity");
+}
+
+{
+    let NaN = 3;
+    console.log(NaN);
+    if (NaN < 4) console.log("NaN");
+}
+
+{
+    let undefined = 3;
+    console.log(undefined);
+    if (undefined < 4) console.log("undefined");
+}
+
+{
+    let x = 3;
+    console.log(x);
+    if (x < 4) console.log("undefined");
+}

crates/swc_ecma_minifier/tests/fixture/issues/7683/1/output.js

@@ -0,0 +1,16 @@
+{
+    let Infinity = 3;
+    console.log(Infinity);
+    if (Infinity > 4) console.log("Infinity");
+}{
+    let NaN1 = 3;
+    console.log(NaN);
+}{
+    let undefined = 3;
+    console.log(undefined);
+    if (undefined < 4) console.log("undefined");
+}{
+    let x = 3;
+    console.log(x);
+    if (x < 4) console.log("undefined");
+}

crates/swc_ecma_minifier/tests/fixture/issues/7683/config.json

@@ -0,0 +1,3 @@
+{
+    "dead_code": true
+}

crates/swc_ecma_utils/src/lib.rs

@@ -902,9 +902,9 @@ pub trait ExprExt {
                 Lit::Str(Str { value, .. }) => return (Pure, num_from_str(value)),
                 _ => return (Pure, Unknown),
             },
-            Expr::Ident(Ident { sym, .. }) => match *sym {
-                js_word!("undefined") | js_word!("NaN") => NAN,
-                js_word!("Infinity") => INFINITY,
+            Expr::Ident(Ident { sym, span, .. }) => match *sym {
+                js_word!("undefined") | js_word!("NaN") if span.ctxt == ctx.unresolved_ctxt => NAN,
+                js_word!("Infinity") if span.ctxt == ctx.unresolved_ctxt => INFINITY,
                 _ => return (Pure, Unknown),
             },
             Expr::Unary(UnaryExpr {
@@ -915,8 +915,9 @@ pub trait ExprExt {
                 &**arg,
                 Expr::Ident(Ident {
                     sym: js_word!("Infinity"),
+                    span,
                     ..
-                })
+                }) if span.ctxt == ctx.unresolved_ctxt
             ) =>
             {
                 -INFINITY
@@ -1005,8 +1006,10 @@ pub trait ExprExt {
                 // converted. unimplemented!("TplLit.
                 // as_string()")
             }
-            Expr::Ident(Ident { ref sym, .. }) => match *sym {
-                js_word!("undefined") | js_word!("Infinity") | js_word!("NaN") => {
+            Expr::Ident(Ident { ref sym, span, .. }) => match *sym {
+                js_word!("undefined") | js_word!("Infinity") | js_word!("NaN")
+                    if span.ctxt == ctx.unresolved_ctxt =>
+                {
                     Known(Cow::Borrowed(&**sym))
                 }
                 _ => Unknown,