Update cheatsheets

ldc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ldc
+
+> D compiler using LLVM as a backend.
+> More information: <https://wiki.dlang.org/Using_LDC>.
+
+- Compile a source code file into an executable binary:
+
+`ldc2 {{path/to/source.d}} -of={{path/to/output_executable}}`
+
+- Compile the source code file without linking:
+
+`ldc2 -c {{path/to/source.d}}`
+
+- Select the target architecture and OS:
+
+`ldc -mtriple={{architecture_OS}} -c {{path/to/source.d}}`
+
+- Display help:
+
+`ldc2 -h`
+
+- Display complete help:
+
+`ldc2 -help-hidden`